/*
 * Copyright 2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.lightframework.jamwiki.servlets;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.jamwiki.DataAccessException;
import org.jamwiki.WikiBase;
import org.jamwiki.servlets.ExportServlet;
import org.jamwiki.servlets.WikiPageInfo;
import org.lightframework.jamwiki.RuntimeWikiException;
import org.lightframework.jamwiki.utils.WikiDatabaseEx;
import org.springframework.web.servlet.ModelAndView;

/**
 * @author fenghm(live.fenghm@gmail.com)
 */
public class ExportServletEx extends ExportServlet {

	@Override
    protected ModelAndView handleJAMWikiRequest(HttpServletRequest request, HttpServletResponse response, ModelAndView next, WikiPageInfo pageInfo)
            throws Exception {

		request.setAttribute("download", true);
		
		if(!StringUtils.isBlank(request.getParameter("exportall"))){
			request = new MockRequest(pageInfo,request);
		}
		
		return super.handleJAMWikiRequest(request, response, next, pageInfo);
    }
	
	private static final class MockRequest extends HttpServletRequestWrapper{

		private WikiPageInfo pageInfo;
		
		public MockRequest(WikiPageInfo pageInfo,HttpServletRequest request) {
	        super(request);
	        this.pageInfo = pageInfo;
        }

		@Override
        public String getParameter(String name) {
			if("export".equals(name)){
				return "save";
			}else if("topics".equals(name)){
				try {
	                List<String> topics = WikiBase.getDataHandler().getAllTopicNames(pageInfo.getVirtualWikiName(), false);
	                StringBuilder builder = new StringBuilder();
	                for(String topic : topics){
	                	if(!WikiDatabaseEx.isDefaultPage(topic)){
	                		builder.append(topic).append("\r\n");
	                	}
	                }
	                return builder.toString().trim();
                } catch (DataAccessException e) {
                	throw new RuntimeWikiException(e.getMessage(),e);
                }
			}else{
				return super.getParameter(name);	
			}
        }
	}
}
